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bcc_syms.h
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bcc_syms.h
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/*
* Copyright (c) 2016 GitHub, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http:https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef LIBBCC_SYMS_H
#define LIBBCC_SYMS_H
#ifdef __cplusplus
extern "C" {
#endif
#include <stdint.h>
#include "linux/bpf.h"
#include "bcc_proc.h"
struct bcc_symbol {
const char *name;
const char *demangle_name;
const char *module;
uint64_t offset;
};
typedef int (*SYM_CB)(const char *symname, uint64_t addr);
#ifndef STT_GNU_IFUNC
#define STT_GNU_IFUNC 10
#endif
#if defined(__powerpc64__) && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
// Indicate if the Local Entry Point (LEP) should be used as a symbol's
// start address
#define STT_PPC64LE_SYM_LEP 31
#endif
static const uint32_t BCC_SYM_ALL_TYPES = 65535;
struct bcc_symbol_option {
int use_debug_file;
int check_debug_file_crc;
// Symbolize on-demand or symbolize everything ahead of time
int lazy_symbolize;
// Bitmask flags indicating what types of ELF symbols to use
uint32_t use_symbol_type;
};
void *bcc_symcache_new(int pid, struct bcc_symbol_option *option);
void bcc_free_symcache(void *symcache, int pid);
// The demangle_name pointer in bcc_symbol struct is returned from the
// __cxa_demangle function call, which is supposed to be freed by caller. Call
// this function after done using returned result of bcc_symcache_resolve.
void bcc_symbol_free_demangle_name(struct bcc_symbol *sym);
int bcc_symcache_resolve(void *symcache, uint64_t addr, struct bcc_symbol *sym);
int bcc_symcache_resolve_no_demangle(void *symcache, uint64_t addr,
struct bcc_symbol *sym);
int bcc_symcache_resolve_name(void *resolver, const char *module,
const char *name, uint64_t *addr);
void bcc_symcache_refresh(void *resolver);
int _bcc_syms_find_module(struct mod_info *info, int enter_ns, void *p);
int bcc_resolve_global_addr(int pid, const char *module, const uint64_t address,
uint8_t inode_match_only, uint64_t *global);
/*bcc APIs for build_id stackmap support*/
void *bcc_buildsymcache_new(void);
void bcc_free_buildsymcache(void *symcache);
int bcc_buildsymcache_add_module(void *resolver, const char *module_name);
int bcc_buildsymcache_resolve(void *resolver,
struct bpf_stack_build_id *trace,
struct bcc_symbol *sym);
// Call cb on every function symbol in the specified module. Uses simpler
// SYM_CB callback mainly for easier to use in Python API.
// Will prefer use debug file and check debug file CRC when reading the module.
int bcc_foreach_function_symbol(const char *module, SYM_CB cb);
// Find the offset of a symbol in a module binary. If addr is not zero, will
// calculate the offset using the provided addr and the module's load address.
//
// If pid is provided, will use it to help lookup the module in the Process and
// enter the Process's mount Namespace.
//
// If option is not NULL, will respect the specified options for lookup.
// Otherwise default option will apply, which is to use debug file, verify
// checksum, and try all types of symbols.
//
// Return 0 on success and -1 on failure. Output will be write to sym. After
// use, sym->module need to be freed if it's not empty.
int bcc_resolve_symname(const char *module, const char *symname,
const uint64_t addr, int pid,
struct bcc_symbol_option* option,
struct bcc_symbol *sym);
#ifdef __cplusplus
}
#endif
#endif